JavaScript: Parse a HTTP Cookie header string and return an object of all cookie name-value pairs
JavaScript fundamental (ES6 Syntax): Exercise-171 with Solution
Write a JavaScript program to parse a HTTP Cookie header string and return an object of all cookie name-value pairs.
- Use String.prototype.split(';') to separate key-value pairs from each other.
- Use Array.prototype.map() and String.prototype.split('=') to separate keys from values in each pair.
- Use Array.prototype.reduce() and decodeURIComponent() to create an object with all key-value pairs.
Sample Solution:
JavaScript Code:
//#Source https://bit.ly/2neWfJ2
const parseCookie = str =>
str
.split(';')
.map(v => v.split('='))
.reduce((acc, v) => {
acc[decodeURIComponent(v[0].trim())] = decodeURIComponent(v[1].trim());
return acc;
}, {});
console.log(parseCookie('foo=bar; equation=E%3Dmc%5E2'));
Sample Output:
{"foo":"bar","equation":"E=mc^2"}
Pictorial Presentation:
Flowchart:

Live Demo:
See the Pen javascript-basic-exercise-171-1 by w3resource (@w3resource) on CodePen.
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Next: Write a JavaScript program to create a function that invokes the provided function with its arguments transformed.
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JavaScript: Tips of the Day
How to check whether a string contains a substring in JavaScript?
ECMAScript 6 introduced String.prototype.includes:
const string = "foo"; const substring = "oo"; console.log(string.includes(substring));
includes doesn't have Internet Explorer support, though. In ECMAScript 5 or older environments, use String.prototype.indexOf, which returns -1 when a substring cannot be found:
var string = "foo"; var substring = "oo"; console.log(string.indexOf(substring) !== -1);
Ref: https://bit.ly/3fFFgZv
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